Thank you On Thu, 7 Jan 2021 at 23:58, Rob Thompson <amessageto...@gmail.com> wrote:
> Limbach previously used TRW valves which are very common in VW rebuilds > but I think (but not sure) genuine VW uses Mahle. > > Limbach changed to a new type a few years ago which are not branded. The > stems are magnetic and the heads hardly magnetic at all. So the valve heads > must be a mostly stainless alloy. > > Problem with all stainless valves is that the stems have a habit of work > hardening and breaking. Particularly when used in combination with hard > seats. Many valve seats are stellite hard faced to cope with unleaded fuels. > > Sodium valves would be interesting to try but it still comes back to the > certified / non-certified engine issue. > > regards > Rob > > Rob Thompson > 0429 493 828 > > > > On Fri, Jan 8, 2021 at 9:35 AM Michael Stockhill <sto...@gmail.com> wrote: > >> Does anyone have an opinion on stainless steel valves or other >> aftermarket stuff. Sodium cooled valves would certainly appeal to me. I had >> a 1972 VW camper with a later generation air cooled engine. It swallowed a >> valve at 40,000 miles. VW had a recall that changed out the solid valves >> for sodium...seemed to be a good fix at the time. >> >> Can we verify that the current Limbach valves are stock VW? >> >> Michael Stockhill >> >> On Thu, Jan 7, 2021, 1:44 PM Rob Thompson <amessageto...@gmail.com> >> wrote: >> >>> Hi Jarek, >>> *Before you change to non genuine heads please make sure you are fully >>> aware of the legal and insurance implications!* >>> >>> - You need to remove the old heads and measure the combustion chamber >>> volume. >>> See https://www.youtube.com/watch?v=yqAr4DUqEt4 >>> >>> - Measure the OD of the cylinder top flange. Sorry I can't remember the >>> figure. >>> >>> - Give those measurements to whoever is machining the heads. >>> >>> - Limbach heads have standard VW size valves and guides. They previously >>> used TRW valves but the current ones do not have any identifying marks. >>> >>> - I do not have any idea which are good brands. You would think that >>> Great Plains should be of reasonable quality. Check out the homebulders' >>> forums like this one >>> http://eaaforums.org/showthread.php?9071-VW-Aircraft-engines-Tell-me-about-your-experiences >>> >>> regards >>> Rob >>> >>> Rob Thompson >>> 0429 493 828 >>> >>> >>> >>> On Fri, Jan 8, 2021 at 7:44 AM Jarek Steliga <jarekstel...@gmail.com> >>> wrote: >>> >>>> >>>> Hello again, >>>> >>>> I'm just wondering if Great Plains will be able to make exactly the >>>> same copies of the Limbach's head on the four points of the spark plug. >>>> I have already contacted the Limbach company and in response I received >>>> these words: "We do not provide any technical data and parameters regarding >>>> the construction of Limbach L2000 heads" >>>> In this case, making a copy of the heads is problematic. >>>> Does anyone know the technical data of the Limbach head. >>>> 1. Head bore for 90mm MAHLE 90ZN4 cylinder. >>>> 2.Combustion chamber size. >>>> 3. inlet valves diameter. >>>> 4. diameter of exhaust valves. >>>> 5. type of valves, what is the diameter of the stem. >>>> 6.Type of valve guides. >>>> 7. What manufacturer of heads to use to copy the Limbach head. There >>>> are Brazilian, Mexican and even Chinese heads ..., the latter apparently >>>> turn out to be very solid in the opinions of car mechanics, but I guess >>>> what matters to us is the opinion of aviation mechanics. >>>> >>>> Regards >>>> Jarek >>>> >>>> >>>> >>>> >>>> . >>>> >>>> ---------- Forwarded message --------- >>>> From: Jarek Steliga <jarekstel...@gmail.com> >>>> Date: Tue, 5 Jan 2021 at 20:47 >>>> Subject: Re: [DOG mailing list] Backup electronic ignition on Limbach >>>> 2000 / Dimona >>>> To: Laurie Hoffman via dog <dog@lists.riverland.net.au> >>>> >>>> >>>> Rob, Ian, >>>> >>>> Thank you. I live in Poland and have my Dimona registered here. We have >>>> been governed by EASA for quite some time. >>>> >>>> Regards >>>> Jarek >>>> >>>> >>>> >>>> On Tue, 5 Jan 2021 at 09:05, Ian Mc Phee <mrsoar...@gmail.com> wrote: >>>> >>>>> The great planes heads may need machining to match the Limbach. Also >>>>> there is, a, Limbach SB re matching heads to cylinders. About 20 years, >>>>> ago Limbach introduced marks on cylinders, and heads and you need to look >>>>> at char to check what goes, with what. >>>>> >>>>> Personally I would give sr no of engine to Limbach and they will make >>>>> up a dual port head and more recently they have improved the underside of >>>>> thrir heads and a little more metal. Yes will cost more. The coils are as >>>>> used on Honda, Gull Wing motorbike from guess 80s. >>>>> >>>>> I do know of a, L2400 engine that got Sauer to make special heads for >>>>> the Limbach as Sauer had much more finning on heads, than Lim ach were >>>>> using. The engine ran for 10 to 12years, perfectly but then they were >>>>> "discovered" and owner was grounded for think 18 months. . The owner got >>>>> Mike Byrne's to to the EO to fit the heads and is all legal. >>>>> >>>>> Ian McPhee >>>>> +61 428847642 >>>>> Box 657 Byron Bay NSW 2481 Australia >>>>> >>>>> On Tue, 5 Jan. 2021, 10:06 Rob Thompson, <amessageto...@gmail.com> >>>>> wrote: >>>>> >>>>>> If you buy the Great Plains cylinder heads, they will machine them to >>>>>> the right cylinder size but you will have to adjust the size of the >>>>>> combustion chamber to get the correct compression ratio. >>>>>> *Please Note: I have not used these Great Plains heads and in most >>>>>> countries you will have to get "Experimental" registration approval to >>>>>> legally use them. * >>>>>> regards >>>>>> Rob >>>>>> >>>>>> Rob Thompson >>>>>> 0429 493 828 >>>>>> >>>>>> >>>>>> >>>>>> On Tue, Jan 5, 2021 at 7:11 AM Jarek Steliga <jarekstel...@gmail.com> >>>>>> wrote: >>>>>> >>>>>>> Rob, >>>>>>> >>>>>>> Thank you. >>>>>>> >>>>>>> Regards >>>>>>> Jarek >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Sun, 3 Jan 2021 at 22:46, Rob Thompson <amessageto...@gmail.com> >>>>>>> wrote: >>>>>>> >>>>>>>> Hi Jarek, >>>>>>>> The rules and regulations are supposed to stop people doing stupid >>>>>>>> things but they also stop people doing sensible things. >>>>>>>> >>>>>>>> Great Plains Aircraft sell dual ignition heads.... >>>>>>>> http://www.greatplainsas.com/sccylheads.html >>>>>>>> >>>>>>>> If you buy these you can always put your Limbach heads back on if >>>>>>>> you want to turn it back into a "certified" motor. >>>>>>>> >>>>>>>> >>>>>>>> regards >>>>>>>> Rob >>>>>>>> >>>>>>>> Rob Thompson >>>>>>>> 0429 493 828 >>>>>>>> >>>>>>>> >>>>>>>> On Mon, Jan 4, 2021 at 7:18 AM Jarek Steliga < >>>>>>>> jarekstel...@gmail.com> wrote: >>>>>>>> >>>>>>>>> Rob, >>>>>>>>> >>>>>>>>> Question is, is it better to have a certified Limbach engine >>>>>>>>> (which has not been modernized for 50 years), or to introduce a second >>>>>>>>> ignition system and be 99% sure that in a critical situation it will >>>>>>>>> save >>>>>>>>> your life. >>>>>>>>> It is strange that such an engine was certified at the time. >>>>>>>>> There is no problem with drilling, as you can see. There are >>>>>>>>> already plants that do it on request, but only in the US. >>>>>>>>> It is strange that Peter Limbach himself or his successors have >>>>>>>>> not introduced this system to their product so far. >>>>>>>>> >>>>>>>>> Generally, SLICK has a mandatory service of 250h / 2 years, but >>>>>>>>> mine was about 40h / 2 years old and the rotor had to be replaced, the >>>>>>>>> engine had already been working badly, so having a secondary ignition >>>>>>>>> system you can feel more confident by 99%. >>>>>>>>> >>>>>>>>> >>>>>>>>> Regards >>>>>>>>> Jarek >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Sun, 3 Jan 2021 at 18:11, Jarek Steliga <jarekstel...@gmail.com> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> Thank you. Looks like none of these has ever been tried by >>>>>>>>>> members of this mailing list. >>>>>>>>>> >>>>>>>>>> Regards >>>>>>>>>> Jarek >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Sun, 3 Jan 2021 at 04:19, Michael Stockhill <sto...@gmail.com> >>>>>>>>>> wrote: >>>>>>>>>> >>>>>>>>>>> Thanks, Rob, >>>>>>>>>>> >>>>>>>>>>> I knew that once. Sod old age. >>>>>>>>>>> >>>>>>>>>>> M >>>>>>>>>>> >>>>>>>>>>> On Sat, Jan 2, 2021, 5:27 PM Rob Thompson < >>>>>>>>>>> amessageto...@gmail.com> wrote: >>>>>>>>>>> >>>>>>>>>>>> Limbach requires a 250 hour magneto inspection on >>>>>>>>>>>> single ignition motors. >>>>>>>>>>>> >>>>>>>>>>>> https://limflug.de/en/support/downloads.php?type=technicalBulletins&id=905.700.020.305.pdf&action=download >>>>>>>>>>>> >>>>>>>>>>>> regards >>>>>>>>>>>> Rob >>>>>>>>>>>> >>>>>>>>>>>> Rob Thompson >>>>>>>>>>>> 0429 493 828 >>>>>>>>>>>> (Please note that my new email address is >>>>>>>>>>>> amessageto...@gmail.com) >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> On Sun, Jan 3, 2021 at 12:05 PM Michael Stockhill < >>>>>>>>>>>> sto...@gmail.com> wrote: >>>>>>>>>>>> >>>>>>>>>>>>> While most mags have a 500 hour inspection interval, with the >>>>>>>>>>>>> Limbach mag being direct drive, and firing with wasted spark, I >>>>>>>>>>>>> believe it >>>>>>>>>>>>> has some interesting environmental issues. It turns much faster >>>>>>>>>>>>> than other >>>>>>>>>>>>> applications and fires more frequently. After seeing my last mag >>>>>>>>>>>>> at 250 >>>>>>>>>>>>> hours, internally it looked more like a 500 hour mag to me. >>>>>>>>>>>>> Hence, I have >>>>>>>>>>>>> decided on that inspection/overhaul interval. Having only one is >>>>>>>>>>>>> a good >>>>>>>>>>>>> incentive. >>>>>>>>>>>>> >>>>>>>>>>>>> Does anyone else have any observations or thoughts on this? >>>>>>>>>>>>> >>>>>>>>>>>>> Michael Stockhill >>>>>>>>>>>>> Polson, MT >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> On Sat, Jan 2, 2021, 4:31 PM Rob Thompson < >>>>>>>>>>>>> amessageto...@gmail.com> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> There are a number of secondary ignition systems designed >>>>>>>>>>>>>> for Aero VW motors. See >>>>>>>>>>>>>> http://www.greatplainsas.com/scsecign.html >>>>>>>>>>>>>> The electronics are easy and cheap. >>>>>>>>>>>>>> The difficult bit is that you have to drill the bottom spark >>>>>>>>>>>>>> plug holes precisely so that you can get a wrench between the >>>>>>>>>>>>>> pushrod >>>>>>>>>>>>>> tubes. If you go ahead, get your engineering company to practice >>>>>>>>>>>>>> on an old >>>>>>>>>>>>>> set of heads. >>>>>>>>>>>>>> This modification will turn your Limbach L2000 into an >>>>>>>>>>>>>> uncertified motor unless you can get a suitable engineering >>>>>>>>>>>>>> approval. >>>>>>>>>>>>>> regards >>>>>>>>>>>>>> Rob >>>>>>>>>>>>>> >>>>>>>>>>>>>> Rob Thompson >>>>>>>>>>>>>> 0429 493 828 >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> On Sat, Jan 2, 2021 at 11:36 PM Jarek Steliga < >>>>>>>>>>>>>> jarekstel...@gmail.com> wrote: >>>>>>>>>>>>>> >>>>>>>>>>>>>>> Hello and all the best in 2021! >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Dimona with the Limbach L2000 engine does not have a second >>>>>>>>>>>>>>> ignition system, because the manufacturer of these engines for >>>>>>>>>>>>>>> unknown >>>>>>>>>>>>>>> reasons did not introduce such a safety system into production. >>>>>>>>>>>>>>> Do you believe a modification now is possible? Or maybe some >>>>>>>>>>>>>>> of you have already made such a modification with a Limbach >>>>>>>>>>>>>>> L2000 engine >>>>>>>>>>>>>>> equipped with one SLICK 4330 type magneto in your bird. >>>>>>>>>>>>>>> In the US it is a popular solution and even all companies >>>>>>>>>>>>>>> offer ready-made kits for such modification, which is >>>>>>>>>>>>>>> definitely additional >>>>>>>>>>>>>>> safety during the flight. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> https://www.kitplanes.com/electronic-ignitions-2/ >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Best regards >>>>>>>>>>>>>>> Jarek >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>>
